Attachment for dovetailing-machines.



H. I. A. HOFF. ATTACHMENT FOR DOVETAILING MACHINES.

APPLICATION FILED SEPT. 2,1908.

Patented Dec. 29, 1908.

}/ ir wfai" NITE STATES PATENT ornron.

SHERMAN- F. A. HOFF, or cINcINNATI, 01-110.

To whom it may concern:

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ATTACHMENT non DOVETAILING-MAGHINES.

Specification of Letters Patent.

Patented Dec. 29, 1908.

Application filed September 2, 1908. Serial No. 451,328.

7 Be it known that, I, HERMAN F. A.-HOFF, a citizen of the United States of America, and resident of Cincinnati, county of Hamilton, State of Ohio ,have invented certain new and useful Improvements in Attachments for- Dovetailing-Machines', of which the following is a specification. The object of my invention is ameans of securing blanks readily, firmly and accurately in position for being dove-tailed. This object is attained by the means de-- scribed in the specification and illustrated in the accompanying drawings, in which,

Figure 1 is a plan view of a dove-tailing machine provided with an attachment embodying my invention. Fig. 2 is 'a front elevation of the upper. part of the machine showing my attachment in front elevation. Fig. 3 is a detail plan view of my attachment. Fig. 4 isa front elevation of the same. Fig. 5 is an end view of the same. Fig. 6 is a detail end view of the plate of my attachment showing the spring clips in place thereon.

I will describe the dove-tailing machine to an extent such as is necessary fora clear understanding of the operation of my attachment;

A, is the reciprocating head upon which the blanks to be operated upon are secured. This head reciprocates in ways, a, formed in the main body of the machine. The front face, A, of the head is plain and has projecting journal bolts, a,o in which an eccentric, a is journaled- The eccentric terminates at one end in a crank, w, by means of which it may be rotated in the bolts, (1., a The reciprocation of the head, A, is controlled by a lever, a Upon the main body of the machine a vertically reciprocating frame, B, is mounted, in which the cutters, b, are carried The movement of the frame, B, is controlled by means of a shaft, 1), and a lever arm, 6 The'parts thus far described are of ordinary construction, and need not, therefore, bemore specifically described.

I w1ll now describe my" attachment. Plate, C, with longitudinal ways, 0, 0, along its upper and lower edges, has perforated at its ends, which pass over the shanks of the journal bolts, a, a Adjacent to the way, 0, plate, 0, has two longitudinal slots, 0 c and adjacent to the way, 0, the plate has longitudinal slots, 0 0 In way, 0, two lug plates, D, D, are adapted to slide. These lug plates have lugs, d, (1, respectively, and may be clamped in the ways by means of set-screws, E, E, which pass through the slots, 0 c and eugage the lug plates. Similar lug plates, D and D are mounted in the ways, 0, and are provided with similar set-screws, E and E I will now describe the use of my attachment for holding the blanks, G, G, which are to constitute the sides of the boxes. These blanks have longitudinal slots formed near theirlower edges, into which the bottom of the box is to be inserted. These blanks, G, G, are placed adjacent of the head, with the grooves in the blank, G, engaging the lugs of the lug-plates, D, D and the grooves in the blank, G, engaging the lugs of the lug-plates, D, D the lugplates, D, D having been adjusted along the ways to accommodate the'blanks, The eccentric, a is then thrown inward so as to clamp the blanks between the face, A, of the head, and the plate, 0, and lug-plates, D, D, D and D The eccentricity of the shaft,

0 is generally sufficient to acccommodate various blanks, but I may utilize spring clips, F, for preventing looseness in the parts. These clips, F, are illustrated in Fig. 6, and consist simply of bars of spring metal having hooks, f, f, at theirupper and lower edges for clamping over the plate, C.

What I claim is:

1. In a dove-tailing machine the combination of a head for holding the blanks to be operated upon, an eccentric mounted adjacent to the face of the head, a plate mounted between the'eccentric and the face of the head and adapted to be moved by the eccentric towards said face, and sliding lug-plates mounted upon the plate adjacent to the face 0f the head.

2. In a dove-tailing machine the combination of a head for receiving the blanks to be operated upon, journal bolts projecting from the face of the head, an eccentric mounted in the journal-bolts, a plate mounted upon 7 the shanks of the journal bolts between the eccentric and the face of the head and sliding plates mounted upon the plate adjacent to the face of the head.

3. In a dove-tailing machine the combination of a head for holding the blanks to be .operated upon, an eccentric mounted adja cent to the face of the head, a plate mounted l upon the plate and set screws engaging the between the eccentric and the face of the i slots and the lug-plates.

head and adapted to be moved by the eccenl e T 1w 1 1 tric towards said face, longitudinal ways HERMAL HOB 5 formed in the plate along its upper and Vfitnesses: 7

lower edges, and slots in the plate adjacent I C. W. MILES, to the ways, lug-plates mounted in the ways I WALTER F. MURRAY. 

